Small Quake Over NW Alabama Last Night
This is from Steve Jones, who runs the great site alabamaquake.com
“I’ve been working on last night’s very small M1.8 Hackleburg earthquake, filtering the recorded trace, and finally revealed the seismic waves buried in the background noise. From 212 km away such a small event is rather hard to see given my location and surface noise considerations.
I have posted the quake’s Huntsville seismogram and epicenter location map at https://alabamaquake.com, on the “Huntsville Seismograms” and “Recent Earthquake Maps” pages, and have attached those images here also.
The fast-traveling P (primary, compressional) seismic waves reached Huntsville about 35 seconds after the event time, and produced a peak vertical ground movement that was calculated to be just 4.8 nanometers (nm) – quite small when you consider that the diameter of a human hair is typically 60,000 nm. There was no S (shear, secondary) wave repsonse to speak of from this very small event, and of course no L (surface) wave response seen in Huntsville from this event.”
Category: Hodgepodge
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James Spann is one of the most recognized and trusted television meteorologists in the industry. He holds the AMS CCM designation and television seals from the AMS and NWA. He is a past winner of the Broadcast Meteorologist of the Year from both professional organizations.Subscribe
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